Take-up device for sewing-machines.



PATENTED 001?. 3,1905.

J. T. HOGAN.

TAKE-UP DEVICE FOR SEWING MACHINES.

APPLICATION FILED MAR. 22, 1905.

2 SHEETS-SHEET 1.

WWMH UH Aununv. a mum" m, mom-umocuwms. wAsmunmu n c UNITED STATES PATENT OFFICE.

JAB [ES T. HOGAN, OF JERSEY CITY, NEW JERSEY, ASSIGNOR TO THE NATIONAL MACHINE COMPANY, OF MAMARONECK, NEW YORK, A

CORPORATION OF N EIV YORK.

TAKE-UP DEVICE FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Oct. 3, 1905.

To all whom it may concern.-

Be it known that I, JAMES T. HOGAN, a citizen of the United States of America, and a resident of Jersey City, county of Hudson, State of New Jersey, have invented certain new and useful Improvements in Take-Up Devices for Sewing-Machines, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in sewingmachines,and particularly to improvements in thread-take-up devices therefor.

The main object of my invention is to provide a take-up device capable of operating at a very high speed and that without undue wear upon the parts. With this object in view it is essential that the movable parts be as light as possible in order to reduce the moment of inertia to a minimum and that the change in direction of movement or in speed of movement shall be as gradual as possible. The most approved type of take-up device is a vibrating lever which has a paying-out movement during the major portion of a revolution of the machine and a take-up movement during a minor portion of a revolution of the machine. In other words, the take-up movement should be very much more rapid than the paying-0E movement. In my invention I provide a take-up lever of this character which has a rapid take-up movement and a relatively smaller paying-off movement and in which the lever comes gradually to a rest position at each end of its stroke and gradually starting from rest position attains the highest speed at about the middle of its movement. A

My invention consists in certain novel features of construction and combination of parts, as will presently appear, and these parts will be seen to be so constructed and arranged as to be affected by wear to the least possible extent.

A further object of my invention is to so provide that the lateral vibration of the needle-baras, for instance, is common in sewing-machines for overstitchingshall not appreciably afl'ect the operating mechanism for the take-up device, so that the mechanism shall be well adapted for employment with vibrating needle-bars.

In order that my invention may be fully understood, I will now proceed to describe an embodiment thereof with reference to the accompanying drawings and will then point out the novel features in claims.

In the drawings, Figure l is a view in end elevation of the arm of a sewing-machine with the cover-plate removed, showing a take-up device embodying my invention. Figs. 2, 3, and 4 are views of the take-up device and operating mechanism therefor, showing the same removed from the sewing-machine. Fig. 5 is a view in vertical transverse section through the take-up device and certain correlated parts. Fig. 6 is a detail view of an eccentric stud and a guide employed, showing the same removed from the machine. Fig. 7 is a detail view, in horizontal section,showing my improved takeup device applied to a machine having a laterally-vibrating needle-bar. Fig. 8 is a diagrammatic view illustrating the movement of the take-up lever and its relation to a revolution of the machine.

In Fig. 1 is shown the end head 1 of the usual overhanging arm of a sewing-machine, 2 designating the upper line of the bed-plate thereof. The end of the usual operatingshaft 3 also appears, being suitably journaled in bearings (not shown) and provided with a crank arm or disk 4:. Mounted in the crank arm or disk is a crank-pin 5, rigidly secured thereto, as by a set-screw 6. (See Fig. 5.) A link or connecting-rod 7 connects the said crank-pin 5 with a needle-bar 8, said connecting-rod being freely hung upon the crank-pin 5 and pivoted to a clamp 9 upon the needle- 1 bar. The needle-bar is permitted free vertical movement in the head, such vertical movement being imparted thereto through the said link connection by rotation of the shaft 3 and crank-pin 5 carried thereby. The take-up lever 10 is pivoted at 11 to a stationary portion of the machine, and is here shown in the form of a bell-crank lever having a second arm 12 in addition to the take-up arm. The take-up arm is provided with an eye 13 at its outer end, through which the thread may pass. The arm 12 has a bearing in a head or guide 14, said head or guide provided with an eccentric stud 15, revolubly mounted in a bearing in the crank-pin 5, said bearing being eccentric of the axis of the said crank-pin.

gagement of the arm 12 with the guide 14 is such as to permit relative longitudinal move- The env ment of the parts, the guide let turning with its stud 15 in the crank-pin as the shaft revolves. It will also be readily understood that while the crank-pin is passing immediately beneath the point of pivotal connection 11 of the lever 10 the movement imparted thereto will be very much greater than during the time the crank-pin is one hundred and eighty degrees farther advanced. This is of course because the guide 14: engages the arm 12 at varying distances toward and away from the point of support of the lever. It will also be clear that when the parts are in the position shown in Fig. 1 or in Fig. 4 the take-up lever will be at the extremes of its position, the crank-pin crossing substantially a deadccnter at each point, the points, however, being by no means at one hundred and eighty degrees apart. In Fig. 8 thelever 10 is shown diagrammatically by a broken dot-and-dash line, its pivotal point of support 11 being shown by a dot. The eye 13 travels along an imaginary line 15, u pon which twenty points are indicated, representing twenty points of equidistantangular advance for a single revolution of the machine. The twenty points of equidistant angular advance are shown diagrammatically upon a circle 16, representing one revolution of the machine, the points upon the line 15 corresponding in relative position thereto. The points upon the righthand side of the line 15 represent upward movements of the take-up lever 10, while the points upon the opposite side thereof represent downward movements thereof. It will be noted that the movement of the lever 10 is gradual at the commencement of its upward movement, increasing to a high rate of speed intermediate the limits of its travel, and gradually decreasing in speed to a point of rest at the upward end of its movement, while the rate of speed during its downward movement is very much less than the rate of speed during its upward movement.

Examining now the construction of the parts, it will be seen that the movements of the various parts are easy and the relative movements of engaging surfaces small. Furthermore, the running parts are light, and the device is therefore capable of running at an exceedingly high rate of speed without undue wear or vibration. t will also be seen that a lateral movement of the needle-bar would have substantially no effect at all upon the take-up mechanism, because the guide 14 is mounted upon the crank-pin and is therefore independent of the connecting-rod 7, which connects with the needle-bar. A lateral vibration of the needle-bar will impart a certain amount of angular movement to the connecting-rod '7; but this angular movement will take place around the crank-pin 14 as a pivot. The planetary movement imparted to the crank-pin thereby will be infinitesimal, and the take-up device herein shown is therefore well adapted for use with machines having a vibrating needle-bar. In Fig. 7 I have shown a detail view in which the take-up device is so connected, the needle-bar 8 being mounted in a vibrating gate 17 of well-known construction. This take-up device may then be used in many classes of sewing-machines such as buttonhole-machines, embroidery-machines, glove stitching machines, and the likeand has therefore a much wider range of adaptability than is common with many of the present types of take-up devices.

hat I claim is-- 1. In a sewing-machine, the combination with a rotary shaft and a crank-pin carried thereby, of a stud revolubly mounted in said crank-pin, eccentric of the axis thereof, a guide secured to and carried by said stud, and a pivoted take-up lever having a portion engaged by said guide.

2. In a sewing-machine, the combination with a rotary shaft and a crank-pin carried thereby, of a stud revolubly mounted in said crank-pin eccentric of the axis thereof, a guide mounted upon said stud eccentric of its own axis, and a pivoted take-up lever having a portion engaged by said guide.

3. In a sewing-machine, the combination with a rotary shaft, of a stud carried thereby, independently revoluble about an axis eccentric of the axis of the shaft, a guide carried by said stud eccentric of its own axis, and a pivoted take up lever having a portion engaged by said guide.

4:. In a sewing-machine, the combination with a rotary shaft, of a stud carried thereby, independently revoluble about an axis eccentric of the axis of the shaft, a guide carried by said stud eccentric of its own axis, and a pivoted bell-crank lever having one arm freely engaged by said guide and its other arm constituting a thread-engaging member operating as a take-up device.

5. In a sewing-imichine, the combination with a rotary shaft and a crank-pin carried thereby, of a stud revolubly mounted in said crank-pin eccentric of the axis thereof, a guide carried by said stud eccentric of its own axis, and a bell-crank lever pivoted to a stationary support having one arm engaging said guide, but moving freely longitudinally therethrough, and its other arm constituting a thread-engaging member operating as a takeup device.

6. In a sewing-machine, the combination with a rotary shaft, a cranlepin carried by said shaft, a needle-bar, and means connecting the said crank-pin with said needle-bar, of a stud carried by said cranl -pin and mounted to rotate with respect thereto about an axis eecentrio of the axis of said crank-pin, a guide carried by said stud and a take-up lever having a portion engaged by said guide.

7. In a sewing-machine, the combination with a rotary shaft, a crank-pin carried by said IIO shaft, a needle-bar, and means connecting said crank-pin with said needle-bar, of a stud carried by said crank-pin and mounted to rotate with respect thereto about an axis eccentric of the axis of said crank-pin, a guide carried by said stud eccentric of its own axis, and a take-up lever having a portion engaged by said guide.

8. In a sewing-machine, the combination with a rotary shaft, a crank-pin carried by said shaft, a needle-bar, a link connecting said crank-pin with said needle-bar, of a stud carried by said crank-pin and mounted to rotate with respect thereto about an axis eccentric of the axis of said crank-pin, a guide carried by said stud, and a take-up lever having a portion engaged by said guide.

9. In a sewing-machine, the combination with a rotary shaft, acrank-pin carried by said shaft, a needle-bar, and means connecting said crank-pin with said needle-bar, of a stud revolubly mounted in said crank-pin eccentric of the axis thereof, a guide carried by said stud, and a take-up lever havinga portion engaged by the said guide.

10. In a sewing-machine, the combination with a rotary shaft, a crank-pin carried by said shaft, a needle-bar, and means connecting said crank-pin With said needle-bar, of a stud revolubly mounted in said crank-pin eccentric of the axis thereof, a guide carried by said stud eccentric of its own axis, and a take-up lever having a portion engaged by the said guide.

11. In a sewing-machine, the combination with a rotary shaft 3, a crank-pin 5 carried by said shaft, a needle-bar and a link 7 connecting said crank-pin With said needle-bar, of a stud 15 revolubly mounted in said crank-pin eccentric of the axis thereof, a guide 14 carried by said stud eccentric of its own axis, a bell-crank lever pivoted to a stationary support, said bell-crank lever having one arm 12 freely engaged by said guide, and another arm 10 constituting a thread-engaging member, substantially as set forth.

JAMES T. HOGAN.

Witnesses:

D. HOWARD HAYWOOD, C. F. CARRINGTON. 

